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This is one of 3 subclasses so far!

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MOLTEN CORE
Heart of the Forge Panther Type: Transcendent Essence ◈ | Origin: Vanice (Adult Emberclaw Chest) | Affinity: Ignithar (Fire)

The Emberclaws of Vanice are walking furnaces, and the Molten Core is the quintessential solidification of that boundless heat. Nestled within a cluster of emberstones deep within an Adult’s chest, this substance is less a mineral and more a stilled moment of volcanic fury. Upon the beast’s death, internal pressure drops and the vascular system collapses, causing this superheated essence to flash-crystallize into jagged, glassy fragments resembling captured lava. Traditionally, Scalehiker Forge Wardens have used these fragments to forge Titanborne blades that never cool and armor that radiates oppressive heat.

However, the aggressive expansion of the Garland Kingdom’s trade arm, the CGC, has introduced these rare curiosities to foreign markets through "dubious" means. When these shards reached the cloistered academies of the Terin Epistocracy, scholars were stunned to discover they were not merely volatile reagents, but unique Transcendent Ignithar Essences. This revelation has sparked a dangerous academic obsession with the Titan-blooded creatures of Vanice, though their ambition is tempered by the lethal risk of harvesting materials from a living Titan.

When channeled by a Fire Arcanist or unleashed via Titanborne weaponry, the core reveals its true nature. It does not merely detonate; it creates a localized cataclysm. The ground at the point of impact is instantly transfigured into a boiling lake of molten slag and rapid-growth thermal crystals. This artificial volcanic zone sears flesh and melts armor, trapping survivors in a landscape of pure Ignithar fury. Yet, arcanists are warned: this Transcendent force does not negotiate. The slightest flaw in containment will result in the wielder being consumed by the very magma they sought to conjure.

MOLTEN CORE

Wondrous Item, Consumable (Rarity Varies) ◈ Essence • Ignithar • Transcendent

Harvested from the molten heart of an ancient Emberclaw, these jagged, pulsing shards are “stilled catastrophes.” They contain raw fragments of Primal Fire that refuse to be tamed.

Essence Casting. As a Bonus Action, you crush the Molten Core, destroying it to empower the next Level 1+ Ignithar (Fire) Essence spell you cast this turn. After the spell’s instantaneous effects resolve as normal, it immediately triggers a Volcanic Cataclysm.

Volcanic Cataclysm (Requires Concentration). The spell erupts into a field of boiling slag centered on a point within its area or on its primary target. The area becomes Difficult Terrain for a number of rounds equal to the empowered spell’s Level. If the empowered spell also required Concentration, this effect overrides and replaces it.

When the Cataclysm appears, when a creature enters the area for the first time on a turn, or when a creature ends its turn there, it must make a Dexterity saving throw against your Spell Save DC (a creature makes this save only once per turn). On a failed save, the creature takes Fire damage and suffers a rarity-specific effect, or half as much damage and no effect on a successful save.

Transcendent Backlash. Harnessing this power is dangerous. When you cast the empowered spell, roll a d20. If the roll is equal to or lower than the Backlash Range, you suffer the consequence immediately. Fire damage from this backlash ignores Resistance and Immunity.

Cataclysm Effects

Rarity	Radius	Damage	Effect On Fail
Rare	5 ft	2d10 Fire	Searing Haze: None.
Very Rare	10 ft	4d10 Fire	Tectonic Shift: The creature has the Hindered (Speed halved) property until the start of its next turn.
Legendary	15 ft	6d10 Fire	Magmatic Pressure: The creature’s Speed is reduced to 0 until the start of its next turn.

Backlash Consequences

Rarity	Range	Catastrophic Consequence
Rare	1	You take 2d10 Fire damage and your Speed decreases by 10 feet for 1 minute.
Very Rare	1–2	You take 4d10 Fire damage and are Grappled by the floor until the end of your next turn.
Legendary	1–3	You take 6d10 Fire damage. If this reduces you to 0 HP, you are Petrified (transmuted into crystal) instead of falling Unconscious.

For more detailed stats and the full collection of Elmodor lore, be sure to check out the Stickied post!

https://www.reddit.com/r/ElmodorBooks/comments/1q1ldos/welcome_to_elmodor_read_this_to_get_started/

If you liked this item, want more or have a cool concept you want me to build, drop a comment! I'm always on the lookout for new inspiration. =)